Total organic carbon in the Bowland-Hodder Unit of the southern Widmerpool Gulf: a discussion

Total organic carbon in the Bowland-Hodder Unit of the southern Widmerpool Gulf: a discussion
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威默普尔湾南部鲍兰德-霍德单元的总有机碳:讨论

DOI:
10.1016/j.petrol.2019.01.097
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发表时间:
2019
影响因子:
--
通讯作者:
Hennissen J
Hennissen J
中科院分区:
工程技术2区
文献类型:
--
作者:
Hennissen J

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Kenomore 等人对这篇文章的评论。 (2017) 对 Widmerpool 海湾次盆地(英国奔宁盆地南部)Bowland 页岩地层的总有机碳 (TOC) 评估揭示了一些缺陷,这些缺陷主要源于对当地石炭系地层的认识不足。基诺莫尔等人。使用 ΔLog R,即 Passey 等人提出的“Passey”方法。 (1990),评估 Widmerpool 湾两个钻孔:Rempstone 1 和 Old Dalby 1 的 TOC 含量。我们在此展示 Kenomore 和合著者使用 Andrews (2013) 发表的来自不同地层的成熟度数据来校准他们的 Bowland 页岩地层(密西西比晚期 - 宾夕法尼亚早期)的 TOC 模型; Rempstone 1 的 Morridge 地层和 Old Dalby 1 的 Widmerpool 地层。我们认为这为 Bowland 页岩地层提供了可行的 TOC 估算,并且由于钻孔的位置,这些 TOC 模型不能代表整个 Widmerpool 湾。威德默普尔湾泥岩中的黄铁矿含量也超过了对地球物理测井产生影响的阈值。除了这些地层学和岩性问题之外,基诺莫尔和合著者还没有充分解决一些方法论上的弱点。用于成熟度校准的岩石评估样品没有可用的岩性信息,由于源地层的互层性质,这对建模练习具有影响。我们建议在对 TOC 进行任何推断之前,从覆盖盆地近端和远端更广泛区域的更大阵列钻孔中收集更多地球化学数据。这在复杂的鲍兰页岩系统中是必要的,因为该系统的岩性变化发生在厘米级,并且不同子盆地之间的相关性尚不清楚。
This review of the article by Kenomore et al. (2017) on the total organic carbon (TOC) evaluation of the Bowland Shale Formation in the Widmerpool Gulf sub-basin (southern Pennine Basin, UK) reveals a number of deficiencies, rooted mostly in an inadequate appreciation of the local Carboniferous stratigraphy. Kenomore et al. use the ΔLog R, the ‘Passey’ method after Passey et al. (1990), to evaluate the TOC content in two boreholes in the Widmerpool Gulf: Rempstone 1 and Old Dalby 1. We show here that Kenomore and co-authors used maturity data, published by Andrews (2013), from different formations to calibrate their TOC models of the Bowland Shale Formation (Late Mississippian–Early Pennsylvanian); the Morridge Formation in Rempstone 1 and the Widmerpool Formation in Old Dalby 1. We contest that this gives viable TOC estimates for the Bowland Shale Formation and that because of the location of the boreholes these TOC models are not representative over the whole of the Widmerpool Gulf. The pyrite content of the mudstones in the Widmerpool Gulf also surpasses the threshold where it becomes an influence on geophysical well logs. Aside from these stratigraphic and lithologic issues, some methodological weaknesses were not adequately resolved by Kenomore and co-authors. No lithological information is available for the Rock-Eval samples used for the maturity calibration, which because of the interbedded nature of the source formations has implications for the modelling exercise. We recommend that more geochemical data from a larger array of boreholes covering a wider area, proximal and distal, of the basin are collected before any inferences on TOC are made. This is necessary in the complex Bowland Shale system where lithological changes occur on a centimetre scale and correlations between the different sub basins are not well understood.
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